diff --git a/README.md b/README.md
index 17aaf00..a373fb2 100644
--- a/README.md
+++ b/README.md
@@ -166,7 +166,7 @@ Usage: check_patroni cluster_has_replica [OPTIONS]
 
   A healthy replica:
   * is in running or streaming state (V3.0.4)
-  * has a replica role
+  * has a replica or sync_standby role
   * has a lag lower or equal to max_lag
 
   Check:
diff --git a/check_patroni/cli.py b/check_patroni/cli.py
index f7e0cae..db3b6d9 100644
--- a/check_patroni/cli.py
+++ b/check_patroni/cli.py
@@ -324,7 +324,7 @@ def cluster_has_replica(
     \b
     A healthy replica:
     * is in running or streaming state (V3.0.4)
-    * has a replica role
+    * has a replica or sync_standby role
     * has a lag lower or equal to max_lag
 
     \b
diff --git a/check_patroni/cluster.py b/check_patroni/cluster.py
index 55e9bdc..26fa4d8 100644
--- a/check_patroni/cluster.py
+++ b/check_patroni/cluster.py
@@ -91,7 +91,7 @@ class ClusterHasReplica(PatroniResource):
         unhealthy_replica = 0
         for member in item_dict["members"]:
             # FIXME are there other acceptable states
-            if member["role"] == "replica":
+            if member["role"] in ["replica", "sync_standby"]:
                 # patroni 3.0.4 changed the standby state from running to streaming
                 if (
                     member["state"] in ["running", "streaming"]
diff --git a/tests/json/cluster_has_replica_ok.json b/tests/json/cluster_has_replica_ok.json
index 547d6c8..a74fcd2 100644
--- a/tests/json/cluster_has_replica_ok.json
+++ b/tests/json/cluster_has_replica_ok.json
@@ -21,7 +21,7 @@
     },
     {
       "name": "srv3",
-      "role": "replica",
+      "role": "sync_standby",
       "state": "running",
       "api_url": "https://10.20.199.5:8008/patroni",
       "host": "10.20.199.5",